"How do we distinguish sounds (continued)" Sound and environment PPT courseware

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"How do we distinguish sounds (continued)" Sound and environment PPT courseware

1. Strength of sound - loudness

Sounds are not only high and low, but also strong and weak.

In physics, the intensity of sound perceived by the human ear is called loudness

Loudness is commonly known as volume or volume.

Activity 1: Explore the factors related to loudness

(1) Sprinkle some small paper scraps on the drum surface, knock the drum gently first, and observe the beating amplitude of the paper scraps; then hit the drum hard, and then observe the beating amplitude of the paper scraps.

What is the relationship between the loudness of a drum and the vibration amplitude of the drum head?

(2) Keep the length of the steel ruler sticking out of the table unchanged, use different forces to make it sound, and carefully observe the amplitude of the steel ruler's vibration, and listen to the difference in the loudness of the sound?

What is the relationship between the loudness of the ruler and the vibration amplitude of the ruler?

The unit of loudness - decibel (dB)

Loudness is also related to the distance from the sound source. The further away from the sound source, the more dispersed the sound is and the lower the loudness of the sound.

How to increase loudness:

1. Increase the amplitude of the sound source

2. Reduce the distance to the sound source

3. Reduce sound dispersion

2. Sound quality - timbre

It turns out that the sounds emitted by different objects have different timbres. It is determined by factors such as the material, structure of the sound body, and the way the sound is produced. Even if the sounds emitted by two sound emitters are of the same pitch and loudness, the human ear can still distinguish them because their timbres are different.

Three characteristics of musical sound: pitch, loudness, and timbre

practice

1 A classmate tapped the same drum head lightly and hit it hard once, making a sound twice ( )

A. Different pitch C. different loudness

B． Different frequencies D. Different timbre

2. On May 17, 2007, the large-scale cultural evening party "China Love and Harmony in Haixi" was staged in Minjiang Park. The audience can distinguish the sounds of different musical instruments based on ( )

A. Different pitch C. different loudness

B． Different frequencies D. Different timbre

3. A sound source is vibrating, but people cannot hear the sound. The following statement is correct: ( )

A. The amplitude of the sound source must be too small

B． The frequency of the sound must be too high or too low

C. There must be no medium between the sound source and the human ear to propagate the sound

D． All three of the above statements are possible

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"How do we distinguish sounds (continued)" Sound and Environment PPT Courseware 2:

"How do we distinguish sounds (continued)" Sound and Environment PPT Courseware 2 Teaching Objectives 1. Know what loudness and timbre are. Know the factors that determine loudness. Understand the units of loudness. 2. Application of timbre. 3. Understand how sounds of different loudness and timbre behave on waves..

"How Do We Distinguish Sounds" Sound and Environment PPT Courseware 2:

"How Do We Distinguish Sounds" Sound and Environment PPT Courseware 2 Learning Objectives 1. Understand one of the characteristics of sound, pitch 2. Know that the pitch of a sound is related to the vibration frequency of the sound emitter, and know how to adjust the pitch of a stringed instrument 3. Understand the sounds of different pitches The difference in waveform...

"How do we distinguish sounds" Sound and Environment PPT courseware:

"How Do We Distinguish Sounds" Sound and Environment PPT Courseware Teaching Objectives 1. Know the pitch of a sound, and know the factors that determine the pitch. Understand the differences in waveforms of sounds of different pitches. 2. Understand the factors that affect the pitch of stringed instruments. three..

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Update Time: 2024-06-19

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume one industry PPT template

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